Generally refers to a very commonplace handgun cartridge first developed for the 1911A1 Colt Autopistol, available in FMJ and JHP. A rather bulky round with a weight of roughly 11 grams, the .45 ACP is seen as the ultimate manstopper by American shooters. Though it is a sub-sonic round that uses relatively low-pressure charge, its sheer size can deliver enough energy to very literally stop a man in his tracks. On the flip side however, it does not have a substantial amount of piercing power. Other .45 cartridges include the .45 LC (for Colt Revolvers), .45 GAP (Glock Auto Pistol), and the .45-60 high-powered revolver load.